An electronic expansion valve control method for an air-cooled unit
An electronic expansion valve and unit technology, applied in heating and ventilation control systems, mechanical equipment, heating and ventilation safety systems, etc., can solve the problems affecting the overall performance of the unit, poor system followability, high suction superheat, etc., to achieve system energy Optimum, optimal system mass flow rate, reduced vibration effect
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[0073] Table 1 and Table 2 are the correspondence tables of superheat degrees under cooling and heating modes respectively, which can be preset in the system at the factory, or manually set through the operation interface; according to Table 1 and Table 2, it can be determined The corresponding superheat target value T;
[0074] Table 1 Correspondence table of superheat degree in cooling mode
[0075] Segmentation principle
Superheat target value T(K)
18～53℃
5
[0076] Table 2 Correspondence table of superheat degree in cooling mode
[0077] Segmentation principle
Superheat target value T(K)
Ta≥5℃
5
Ta<5°C
2
[0078] Table 3 is a comparison table of the initial opening of the electronic expansion valve, which is used for the unit system to determine the initial opening of the electronic expansion valve according to the current operating mode, ambient temperature Ta and return water temperature Tewi;
[0079] T...
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